Harmful to human: Yes, this jellyfish can secrete a mucus from its nematocyst. The mucus contains a toxin which can cause cardiac problems in animals and humans

Predators: Some species of crab, leatherback sea turtles

Maximum size: Its dome-shaped bell can reach 25 cm (10 inches)

Colour: Brown/tan

Feeding: zooplankton such as veligers and red drum larvae.

Photosynthetic: No

Habitat: Estuarian waters

Distribution: North America's eastern seaboard all the way to Brazil

Average water temperature: 23.1 °C (73.6 °F)

Average Salinity: 33.8 ppt (parts per thousand)

Other Notes: Cannonball jellyfish have a symbiotic relationship with the portly spider crab (Libinia emarginata), which also eats the small zooplankton. The crab feeds on the prey captured by the jellyfish.

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